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163 Days of Good Air Quality or Above in Ji’nan From January to September.

http://english.e23.cn2021-11-04 14:56:08

Abstract：　　The air quality composite index of Ji’nan from January to September was 4.45, a year-on-year improvement...

　　The air quality composite index of Ji’nan from January to September was 4.45, a year-on-year improvement of 11%. Six pollutants making up the composite index have improved. The PM 2.5 concentration has improved 17.8% .

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